lib/lws-plat-unix.c

   1 #include "private-libwebsockets.h"
   2
   3 /*
   4  * included from libwebsockets.c for unix builds
   5  */
   6
   7 unsigned long long time_in_microseconds(void)
   8 {
   9         struct timeval tv;
  10         gettimeofday(&tv, NULL);
  11         return ((unsigned long long)tv.tv_sec * 1000000LL) + tv.tv_usec;
  12 }
  13
  14 LWS_VISIBLE int libwebsockets_get_random(struct libwebsocket_context *context,
  15                                                              void *buf, int len)
  16 {
  17         return read(context->fd_random, (char *)buf, len);
  18 }
  19
  20 LWS_VISIBLE int lws_send_pipe_choked(struct libwebsocket *wsi)
  21 {
  22         struct libwebsocket_pollfd fds;
  23
  24         /* treat the fact we got a truncated send pending as if we're choked */
  25         if (wsi->truncated_send_len)
  26                 return 1;
  27
  28         fds.fd = wsi->sock;
  29         fds.events = POLLOUT;
  30         fds.revents = 0;
  31
  32         if (poll(&fds, 1, 0) != 1)
  33                 return 1;
  34
  35         if ((fds.revents & POLLOUT) == 0)
  36                 return 1;
  37
  38         /* okay to send another packet without blocking */
  39
  40         return 0;
  41 }
  42
  43 LWS_VISIBLE int
  44 lws_poll_listen_fd(struct libwebsocket_pollfd *fd)
  45 {
  46         return poll(fd, 1, 0);
  47 }
  48
  49 /*
  50  * This is just used to interrupt poll waiting
  51  * we don't have to do anything with it.
  52  */
  53 static void lws_sigusr2(int sig)
  54 {
  55 }
  56
  57 /**
  58  * libwebsocket_cancel_service() - Cancel servicing of pending websocket activity
  59  * @context:    Websocket context
  60  *
  61  *      This function let a call to libwebsocket_service() waiting for a timeout
  62  *      immediately return.
  63  */
  64 LWS_VISIBLE void
  65 libwebsocket_cancel_service(struct libwebsocket_context *context)
  66 {
  67         char buf = 0;
  68
  69         if (write(context->dummy_pipe_fds[1], &buf, sizeof(buf)) != 1)
  70                 lwsl_err("Cannot write to dummy pipe");
  71 }
  72
  73 LWS_VISIBLE void lwsl_emit_syslog(int level, const char *line)
  74 {
  75         int syslog_level = LOG_DEBUG;
  76
  77         switch (level) {
  78         case LLL_ERR:
  79                 syslog_level = LOG_ERR;
  80                 break;
  81         case LLL_WARN:
  82                 syslog_level = LOG_WARNING;
  83                 break;
  84         case LLL_NOTICE:
  85                 syslog_level = LOG_NOTICE;
  86                 break;
  87         case LLL_INFO:
  88                 syslog_level = LOG_INFO;
  89                 break;
  90         }
  91         syslog(syslog_level, "%s", line);
  92 }
  93
  94 LWS_VISIBLE int
  95 lws_plat_service(struct libwebsocket_context *context, int timeout_ms)
  96 {
  97         int n;
  98         int m;
  99         char buf;
 100         struct libwebsocket *wsi, *wsi_next;
 101
 102         /* stay dead once we are dead */
 103
 104         if (!context)
 105                 return 1;
 106
 107         lws_libev_run(context);
 108
 109         context->service_tid = context->protocols[0].callback(context, NULL,
 110                                      LWS_CALLBACK_GET_THREAD_ID, NULL, NULL, 0);
 111
 112 #ifdef LWS_OPENSSL_SUPPORT
 113         /* if we know we have non-network pending data, do not wait in poll */
 114         if (lws_ssl_anybody_has_buffered_read(context))
 115                 timeout_ms = 0;
 116 #endif
 117         n = poll(context->fds, context->fds_count, timeout_ms);
 118         context->service_tid = 0;
 119
 120 #ifdef LWS_OPENSSL_SUPPORT
 121         if (!lws_ssl_anybody_has_buffered_read(context) && n == 0) {
 122 #else
 123         if (n == 0) /* poll timeout */ {
 124 #endif
 125                 libwebsocket_service_fd(context, NULL);
 126                 return 0;
 127         }
 128
 129         if (n < 0) {
 130                 if (LWS_ERRNO != LWS_EINTR)
 131                         return -1;
 132                 return 0;
 133         }
 134
 135 #ifdef LWS_OPENSSL_SUPPORT
 136         /*
 137          * For all guys with buffered SSL read data already saved up, if they
 138          * are not flowcontrolled, fake their POLLIN status so they'll get
 139          * service to use up the buffered incoming data, even though their
 140          * network socket may have nothing
 141          */
 142
 143         wsi = context->pending_read_list;
 144         while (wsi) {
 145                 wsi_next = wsi->pending_read_list_next;
 146                 context->fds[wsi->sock].revents |=
 147                                 context->fds[wsi->sock].events & POLLIN;
 148                 if (context->fds[wsi->sock].revents & POLLIN) {
 149                         /*
 150                          * he's going to get serviced now, take him off the
 151                          * list of guys with buffered SSL.  If he still has some
 152                          * at the end of the service, he'll get put back on the
 153                          * list then.
 154                          */
 155                         lws_ssl_remove_wsi_from_buffered_list(context, wsi);
 156                 }
 157                 wsi = wsi_next;
 158         }
 159 #endif
 160
 161         /* any socket with events to service? */
 162
 163         for (n = 0; n < context->fds_count; n++) {
 164
 165                 if (!context->fds[n].revents)
 166                         continue;
 167
 168                 if (context->fds[n].fd == context->dummy_pipe_fds[0]) {
 169                         if (read(context->fds[n].fd, &buf, 1) != 1)
 170                                 lwsl_err("Cannot read from dummy pipe.");
 171                         continue;
 172                 }
 173
 174                 m = libwebsocket_service_fd(context, &context->fds[n]);
 175                 if (m < 0)
 176                         return -1;
 177                 /* if something closed, retry this slot */
 178                 if (m)
 179                         n--;
 180         }
 181
 182         return 0;
 183 }
 184
 185 LWS_VISIBLE int
 186 lws_plat_set_socket_options(struct libwebsocket_context *context, int fd)
 187 {
 188         int optval = 1;
 189         socklen_t optlen = sizeof(optval);
 190
 191 #if defined(__APPLE__) || defined(__FreeBSD__) || defined(__NetBSD__) || \
 192     defined(__OpenBSD__)
 193         struct protoent *tcp_proto;
 194 #endif
 195
 196         if (context->ka_time) {
 197                 /* enable keepalive on this socket */
 198                 optval = 1;
 199                 if (setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE,
 200                                              (const void *)&optval, optlen) < 0)
 201                         return 1;
 202
 203 #if defined(__APPLE__) || defined(__FreeBSD__) || defined(__NetBSD__) || \
 204         defined(__CYGWIN__) || defined(__OpenBSD__)
 205
 206                 /*
 207                  * didn't find a way to set these per-socket, need to
 208                  * tune kernel systemwide values
 209                  */
 210 #else
 211                 /* set the keepalive conditions we want on it too */
 212                 optval = context->ka_time;
 213                 if (setsockopt(fd, IPPROTO_TCP, TCP_KEEPIDLE,
 214                                              (const void *)&optval, optlen) < 0)
 215                         return 1;
 216
 217                 optval = context->ka_interval;
 218                 if (setsockopt(fd, IPPROTO_TCP, TCP_KEEPINTVL,
 219                                              (const void *)&optval, optlen) < 0)
 220                         return 1;
 221
 222                 optval = context->ka_probes;
 223                 if (setsockopt(fd, IPPROTO_TCP, TCP_KEEPCNT,
 224                                              (const void *)&optval, optlen) < 0)
 225                         return 1;
 226 #endif
 227         }
 228
 229         /* Disable Nagle */
 230         optval = 1;
 231 #if !defined(__APPLE__) && !defined(__FreeBSD__) && !defined(__NetBSD__) && \
 232     !defined(__OpenBSD__)
 233         if (setsockopt(fd, SOL_TCP, TCP_NODELAY, (const void *)&optval, optlen) < 0)
 234                 return 1;
 235 #else
 236         tcp_proto = getprotobyname("TCP");
 237         if (setsockopt(fd, tcp_proto->p_proto, TCP_NODELAY, &optval, optlen) < 0)
 238                 return 1;
 239 #endif
 240
 241         /* We are nonblocking... */
 242         if (fcntl(fd, F_SETFL, O_NONBLOCK) < 0)
 243                 return 1;
 244
 245         return 0;
 246 }
 247
 248 LWS_VISIBLE void
 249 lws_plat_drop_app_privileges(struct lws_context_creation_info *info)
 250 {
 251         if (info->gid != -1)
 252                 if (setgid(info->gid))
 253                         lwsl_warn("setgid: %s\n", strerror(LWS_ERRNO));
 254         if (info->uid != -1)
 255                 if (setuid(info->uid))
 256                         lwsl_warn("setuid: %s\n", strerror(LWS_ERRNO));
 257 }
 258
 259 LWS_VISIBLE int
 260 lws_plat_init_fd_tables(struct libwebsocket_context *context)
 261 {
 262         if (lws_libev_init_fd_table(context))
 263                 /* libev handled it instead */
 264                 return 0;
 265
 266         if (pipe(context->dummy_pipe_fds)) {
 267                 lwsl_err("Unable to create pipe\n");
 268                 return 1;
 269         }
 270
 271         /* use the read end of pipe as first item */
 272         context->fds[0].fd = context->dummy_pipe_fds[0];
 273         context->fds[0].events = LWS_POLLIN;
 274         context->fds[0].revents = 0;
 275         context->fds_count = 1;
 276
 277         context->fd_random = open(SYSTEM_RANDOM_FILEPATH, O_RDONLY);
 278         if (context->fd_random < 0) {
 279                 lwsl_err("Unable to open random device %s %d\n",
 280                                     SYSTEM_RANDOM_FILEPATH, context->fd_random);
 281                 return 1;
 282         }
 283
 284         return 0;
 285 }
 286
 287 static void sigpipe_handler(int x)
 288 {
 289 }
 290
 291
 292 LWS_VISIBLE int
 293 lws_plat_context_early_init(void)
 294 {
 295         sigset_t mask;
 296
 297         signal(SIGUSR2, lws_sigusr2);
 298         sigemptyset(&mask);
 299         sigaddset(&mask, SIGUSR2);
 300
 301         sigprocmask(SIG_BLOCK, &mask, NULL);
 302
 303         signal(SIGPIPE, sigpipe_handler);
 304
 305         return 0;
 306 }
 307
 308 LWS_VISIBLE void
 309 lws_plat_context_early_destroy(struct libwebsocket_context *context)
 310 {
 311 }
 312
 313 LWS_VISIBLE void
 314 lws_plat_context_late_destroy(struct libwebsocket_context *context)
 315 {
 316         close(context->dummy_pipe_fds[0]);
 317         close(context->dummy_pipe_fds[1]);
 318         close(context->fd_random);
 319 }
 320
 321 /* cast a struct sockaddr_in6 * into addr for ipv6 */
 322
 323 LWS_VISIBLE int
 324 interface_to_sa(struct libwebsocket_context *context,
 325                 const char *ifname, struct sockaddr_in *addr, size_t addrlen)
 326 {
 327         int rc = -1;
 328
 329         struct ifaddrs *ifr;
 330         struct ifaddrs *ifc;
 331 #ifdef LWS_USE_IPV6
 332         struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)addr;
 333 #endif
 334
 335         getifaddrs(&ifr);
 336         for (ifc = ifr; ifc != NULL && rc; ifc = ifc->ifa_next) {
 337                 if (!ifc->ifa_addr)
 338                         continue;
 339
 340                 lwsl_info(" interface %s vs %s\n", ifc->ifa_name, ifname);
 341
 342                 if (strcmp(ifc->ifa_name, ifname))
 343                         continue;
 344
 345                 switch (ifc->ifa_addr->sa_family) {
 346                 case AF_INET:
 347 #ifdef LWS_USE_IPV6
 348                         if (LWS_IPV6_ENABLED(context)) {
 349                                 /* map IPv4 to IPv6 */
 350                                 bzero((char *)&addr6->sin6_addr,
 351                                                 sizeof(struct in6_addr));
 352                                 addr6->sin6_addr.s6_addr[10] = 0xff;
 353                                 addr6->sin6_addr.s6_addr[11] = 0xff;
 354                                 memcpy(&addr6->sin6_addr.s6_addr[12],
 355                                         &((struct sockaddr_in *)ifc->ifa_addr)->sin_addr,
 356                                                         sizeof(struct in_addr));
 357                         } else
 358 #endif
 359                                 memcpy(addr,
 360                                         (struct sockaddr_in *)ifc->ifa_addr,
 361                                                     sizeof(struct sockaddr_in));
 362                         break;
 363 #ifdef LWS_USE_IPV6
 364                 case AF_INET6:
 365                         memcpy(&addr6->sin6_addr,
 366                           &((struct sockaddr_in6 *)ifc->ifa_addr)->sin6_addr,
 367                                                        sizeof(struct in6_addr));
 368                         break;
 369 #endif
 370                 default:
 371                         continue;
 372                 }
 373                 rc = 0;
 374         }
 375
 376         freeifaddrs(ifr);
 377
 378         if (rc == -1) {
 379                 /* check if bind to IP adddress */
 380 #ifdef LWS_USE_IPV6
 381                 if (inet_pton(AF_INET6, ifname, &addr6->sin6_addr) == 1)
 382                         rc = 0;
 383                 else
 384 #endif
 385                 if (inet_pton(AF_INET, ifname, &addr->sin_addr) == 1)
 386                         rc = 0;
 387         }
 388
 389         return rc;
 390 }
 391
 392 LWS_VISIBLE void
 393 lws_plat_insert_socket_into_fds(struct libwebsocket_context *context,
 394                                                        struct libwebsocket *wsi)
 395 {
 396         lws_libev_io(context, wsi, LWS_EV_START | LWS_EV_READ);
 397         context->fds[context->fds_count++].revents = 0;
 398 }
 399
 400 LWS_VISIBLE void
 401 lws_plat_delete_socket_from_fds(struct libwebsocket_context *context,
 402                                                 struct libwebsocket *wsi, int m)
 403 {
 404 }
 405
 406 LWS_VISIBLE void
 407 lws_plat_service_periodic(struct libwebsocket_context *context)
 408 {
 409         /* if our parent went down, don't linger around */
 410         if (context->started_with_parent &&
 411                               kill(context->started_with_parent, 0) < 0)
 412                 kill(getpid(), SIGTERM);
 413 }
 414
 415 LWS_VISIBLE int
 416 lws_plat_change_pollfd(struct libwebsocket_context *context,
 417                       struct libwebsocket *wsi, struct libwebsocket_pollfd *pfd)
 418 {
 419         return 0;
 420 }
 421
 422 LWS_VISIBLE int
 423 lws_plat_open_file(const char* filename, unsigned long* filelen)
 424 {
 425         struct stat stat_buf;
 426         int ret = open(filename, O_RDONLY);
 427
 428         if (ret < 0)
 429                 return LWS_INVALID_FILE;
 430
 431         if (fstat(ret, &stat_buf) < 0) {
 432                 close(ret);
 433                 return LWS_INVALID_FILE;
 434         }
 435         *filelen = stat_buf.st_size;
 436         return ret;
 437 }
 438
 439 #ifdef LWS_USE_IPV6
 440 LWS_VISIBLE const char *
 441 lws_plat_inet_ntop(int af, const void *src, char *dst, int cnt)
 442 {
 443         return inet_ntop(af, src, dst, cnt);
 444 }
 445 #endif